This evening 38-year-old heather abbott was blown right off the sidewalk by that bomb. I felt like my foot was on fire. I knew I couldn't stand up. And I was thinking, who is going to help me? Everyone is running for their lives. And to my surprise, if someone had told me that I was going to have half a leg, basically, at basically, before this happened, I think I would never have believed it. Reporter: But today, while still in that hospital, she revealed true bravery for the road ahead. You can't sit there and say, What if I arrived five minutes later or five minutes earlier? If I didn't have the support system in my family and friends that I do, I think I would be devastated. I don't think I would have a positive outlook, but it's so hard for me to focus on anything negative, because they're always around. Reporter: And there was more humor. When trying to remember that visit from mrs. Obama. I was under the influence of a lot of medications. So I wish I remembered it better. she talked about the fact that she typically gives this certain coin out to military personnel who are injured, and she actually gave one to me.

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